Low fuel mileage on Semi Trucks

Discussion in 'Questions From New Drivers' started by Bascht, Jun 15, 2019.

  1. Bascht

    Bascht Bobtail Member

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    Apr 27, 2019
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    Any note about fuel usage on semis has very low mileage and I don’t understand this. I drive a 2018 Pete 579. It has new factory standard tires. I use cruise control liberally. Never step fully on the gas except on steep mountainsides. Bobtail goes up to 12 mi, deadhead in a flat area takes about 10 to 11 mi, running 40,000 lbs load from Albuquerque to OKC is 8.3 mi with the AC running flat out. So I don’t get it why someone on YouTube said he gets out of his 2019 Mack truck (40,000 lbs load) only 5.3 mi. I drove a 2015 Freightliner who did 8.5 deadhead and 7.5 with a 30,000 lbs load. Still not bad. So why are these other figures so low? Herbert
     
  2. Ridgeline

    Ridgeline Road Train Member

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    So low?

    Those look good.
     
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  3. Intothesunset

    Intothesunset Road Train Member

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    Because Volvo is trying to kill Mack.
     
  4. starmac

    starmac Road Train Member

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  5. Tb0n3

    Tb0n3 Road Train Member

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    Ratios,different shoes(blocks), different trailer type/gap between cab and trailer, different operating location, midroof, etc
     
  6. rbrtwbstr

    rbrtwbstr Road Train Member

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    You do realize that not everyone runs dry van or reefer trailers, on roads other than four lane highways?

    I see the four lane highway for about 50% of my night. The rest of the time I'm on some two lane goatpath climbing some mountain. And, with a tanker, I'm either 80,000+, or empty at 26,000.

    My lifetime mileage on this truck, which is a 2108 Western Star 4900 glider is 5.43 mpg. And I'm not alone with those numbers. Actually, I have the best in our fleet. We have a fellow that averages 4.9. Other companies in the area that we run report the same thing.

    Would an aerodynamic truck help? I doubt it would help much, given the average driving speed is only about 55mph.
     
  7. starmac

    starmac Road Train Member

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    Fairbanks Ak
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    Different speeds.
    A total multitude. of reasons.
    My trips are 1012 miles round trip returning empty. I can not average 5 mph, but I will burn a solid 100 gallons less than a lot of trucks, per trip.
    If I stay on a pipe dolly or flatbed, I can do just a tad over 5, but a tad under wth a van or reefer, and I get stuck with ltl loads a lot.
    They have some 4 axle reefers that just coming back empty will add as much as 50 gallons to the trip. lol
     
  8. Crazytrucker77

    Crazytrucker77 Medium Load Member

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    Hermiston, OR
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    2016 Pete 579 life 6.83 mpg
     
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  9. Canadianhauler21

    Canadianhauler21 Medium Load Member

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    Ontario, Canada
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    I get about 5.5 on company 2016 579 because of idle times. Lowest I've seen is 4.5, my company must have crap specs. Highest I've seen on 579 is 6.2.
     
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  10. tinytim

    tinytim Road Train Member

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    hmm, thought that flux capacitor would be more efficient than that. :|
     
    Last edited: Jun 16, 2019
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